About This File
X-Plane 10 Northrop YA-9A. The Northrop YA-9 was a prototype attack aircraft developed for the United States Air Force A-X program in 1972. The YA9 was passed over in preference for the Fairchild Republic YA-10 that entered production as the A-10 Thunderbolt II. Documentation included in the package. By Billy Bargagliotti.